2. CHAPTER 1 – FUNDAMENTALS OF DBMS
WHAT IS DBMS?
A very large integrated collection of data.
Models real-world enterprise.
Entities (e.g., students, courses)
Relationships (e.g.,Madonna is
t a k i n g FP304 )
A Database Management System is a
software package designed to store and
manage database
3. CHAPTER 1 – FUNDAMENTALS OF DBMS
WHY USE A DBMS?
Data
independence and efficient access
Reduced
Data
application development time
integrity and security
Unifrom
data administration
Concurrent
access recovery from crashers
4. CHAPTER 1 – FUNDAMENTALS OF DBMS
WHY STUDY DATABASES?
Shift
from computation to information
at the “low end”: scramble to webspace (a mess!)
at the :high end”: scientific applications
Datasets
increasing in diversity and volume
Digital libraries, interactive video
... Nned for DBMS exploding
5. CHAPTER 1 – FUNDAMENTALS OF DBMS
FILES VS. DATABASES
6. CHAPTER 1 – FUNDAMENTALS OF DBMS
ADVANTAGES OF DBMS
Control
Data
of data redundancy
consistency
Sharing
of data
Improved
security
Improved
backup and recovery services
7. CHAPTER 1 – FUNDAMENTALS OF DBMS
DISADVANTAGES OF DBMS
Complexity
Size
Cost
of DBMSs
Higher
impact of a failure
8. CHAPTER 1 – FUNDAMENTALS OF DBMS
VARIOUS COMMON OF DBMS
Oracle
Microsoft
SQL
Access
Server
Sybase
FoxPro
9. CHAPTER 1 – FUNDAMENTALS OF DBMS
FEATURES OF DBMS
Database definition
Nonprocedural access
Application development
Procedural language interface
Transaction processing
Database tuning
[BUT, THIS IS AN ASSIGNMENT AND PRESENT!]
[PERFORM IN 3 GROUPS]
10. CHAPTER 1 – FUNDAMENTALS OF DBMS
THREE-SCHEMA ARCHITECTURE
OF DBMS
First
Level:
Internal schema at the internal level to
describe data storage structures and
access paths. Typically uses a physical data
model.
11. CHAPTER 1 – FUNDAMENTALS OF DBMS
THREE-SCHEMA ARCHITECTURE
OF DBMS
Second
Level:
Conceptual schema at the conceptual
level to describe the structure and
constraints for the whole database. Uses a
conceptual or an implementation data
model.
12. CHAPTER 1 – FUNDAMENTALS OF DBMS
THREE-SCHEMA ARCHITECTURE
OF DBMS
Third
Level:
External schema at the external level to
describe the various user views. Usually
uses the same data model as the
conceptual level.
13. CHAPTER 1 – FUNDAMENTALS OF DBMS
CLIENT-SERVER ARCHITECTURE
OF DBMS
14. CHAPTER 1 – FUNDAMENTALS OF DBMS
TRADITIONAL TWO-TIER CLIENTSERVER ARCHITECTURE
Advantages:
It enables wider access to existing
databases.
Increased performance
Hardware costs may be reduced
Communication costs are reduced
15. CHAPTER 1 – FUNDAMENTALS OF DBMS
THREE-TIER CLIENT-SERVER
ARCHITECTURE
Advantages:
The need for less expensive hardware
Application maintenance is centralized.
The added modularity makes it easier to modify or
replace one tier without affecting the other tier.
Load balancing is easier with the separation of
core business logic from the database functions.
16. CHAPTER 1 – FUNDAMENTALS OF DBMS
CATEGORIES OF DBMS
Desktop
Database
Desktop databases offer an inexpensive,
simple solution to many less complex data
storage and manipulation requirements.
They earn their name by virtue of the fact
that they are designed to run on “desktop”
(or personal) computers.
17. CHAPTER 1 – FUNDAMENTALS OF DBMS
CATEGORIES OF DBMS
Server
Database
Offer organizations the ability to manage
large amounts of data efficiently and in a
manner that enables many users to access
and update the data simultaneously.
If you’re able to carry the hefty pricetag, a
server-based database can provide you
with a comprehensive data management
solution.
18. CHAPTER 1 – FUNDAMENTALS OF DBMS
CATEGORIES OF DBMS
1.
Desktop databases.
.Example
of desktop databases:
Microsoft Access – from Microsoft in Windows OS.
FoxPro – Windows, Macintosh & UNIX
FileMaker Pro – DOS, all Windows except Win2000.
Paradox – DOS, Windows
Lotus – based on a network server
19. CHAPTER 1 – FUNDAMENTALS OF DBMS
CATEGORIES OF DBMS
2.
Server databases
.Examples
of server databases
Oracle,
Microsoft SQL Server, and
IBM DB2
20. CHAPTER 1 – FUNDAMENTALS OF DBMS
BENEFITS OF DESKTOP DATABASE
1.
Inexpensive
2.
User-friendly - Desktop DBMSs usually offer
an easy-to-navigate graphical user
interface.
3.
Offers web solution - Many modern desktop
databases provide web functionality
enabling you to publish your data on the
web in a static or dynamic fashion.
21. CHAPTER 1 – FUNDAMENTALS OF DBMS
BENEFITS OF SERVER DATABASE
1.
Flexibility - Server-based databases can handle just about
any data management problem you can throw at them.
2.
Powerful performance - Modern databases can manage
multiple high-speed processors, clustered servers, high
bandwidth connectivity and fault tolerant storage
technology.
3.
Scalability - server databases are able to gracefully handle
a rapidly expanding amount of users and/or data.
22. CHAPTER 1 – FUNDAMENTALS OF DBMS
DEFINE THE REQUIREMENTS
Who will be using the database and what tasks will they
perform?
How often will the data be modified? Who will make
these modifications?
Who will be providing IT support for the database?
What hardware is available? Is there a budget for
purchasing additional hardware?
Who will be responsible for maintaining the data?
Will data access be offered over the Internet? If so, what
level of access should be supported?
23. DEFINE THE REQUIREMENTS
You
may discover that a sophisticated
multi-user server platform (like SQL Server
or Oracle) is necessary to support your
complex requirements.
On
the other hand, a desktop database
like Microsoft Access might be just as
capable of meeting your needs
24. DATABASE IN SOCIETY
Bank
Sector
Government
Sector
Telecommunication
Hospitals
Hypermarkets
Sector
